Brake mechanism for reversing gearing



May 30, 1933. w. c. WARE BRAKE MECHANISM FOR REVERSING GEARING Filed April l, l1929 Patented May 30, 1933 UN lTED STATESy 'sries q WALTER' c. WARE, orV TAUNTON, Massecnusnrrs, Assre'noa To EVANS srAMrnvG .AND PLATING COMPANY, OF TUNTON, MSSCHUSETT'S, lA CORPORATION 0F MASSACHUSETTS BRAKE' MEGHANISM For. nnvnn'srns ernannte?v Application sied April' 1, 1929. seriai No.. 351,596:

rI-`his invention relates to reversing mechanisms and particularly to a brake mechanism adapted to set the reversing mechanism for reverse drive.

Reversing mechanism of the planetary gearing type usually includes al rotatable.

element constituting a brake drum,` and a brake band which: encircles the drum and is1 adapted to engage the brake drumy and holdVY it stationary and thereby condition the reversing mechanism for reverse drive. The

brake band usually is flexible and has spaced confronting ends which are adapted to be drawnv together to contract thebralre band about the drum.` The mechanism for contracting the brake band usually includes ahorizontal bar or rod which is movable' lengthwise andV axially of the gearing and has a cam face that engages components of the confronting ends-*of the brake band upon longitudinal movement of the bar'to eiect the contraction of the brake band. Due to the contracting movement, and also tov the lengthwise movement of the bar, the ends ofthe bandy assume various positions relative provision ofbrake mechanism Jior the type of reversing mechanism abovesetforth Wherein the cam rodfor bar has a broad seat upon one of theendsof the brake-band regardless ofV any lchange that mayftake place in the relative positions of the brakeband and cam bar under the usual conditions of operationfand weer. l

A further object' of the invention is the provision of a` contractile brake bandv having confronting ends, a rod carried by one of the ends of the brake band and extended through the other end, and a cam bar movable longitudinally of the mechanism having a tapered or cam face which engages the aforesaid rod and alat face that has a uni.- versal seat upon the other end of the brake band, whereby the bar and the ends of the brake band clan-assume other than parallel positions witlrrespect to each other without edecting, the flat seatof the cam' bar on the band. f v v f A further object-Vis generally to improve the construction and operation of reversing mechanisms and brake mechanisms therefor. FignlA is a side elevation,.partly in section, of areversing mechanism embodying the presentinventio'n. s Y -v Fig. .2.is af sectional detail along` line 2-2 oiiliig.v l.. y A Y Y Fig. 3 is a partial plan view of the mechanismof Fig. 1. p y

Fig. 4 is a side elevation of Figi2.; Y Fig. v5V is a plan view' of the Vself-seating pressure disc of Figs.- 2, 3 andfl.` s .Y

The reversing mechanism or gearing herein shown is' substantially as illustrated in the Henry. A. rluttle Patent No. 1,694,295,-dated December Ll,Y 1928. This gearing. is'merely` chosen to illustrate the invention; and-the invention is rapplicable to other kreversinggearingsand brake mechanisms as well.-

Thereversing gearingihere. shown includesv thedriving shaft 10. andthe drivenishaft 1:2 kwhich are arranged'in axial-alignment. VA hub 14:. is secured to the drivingishaft and hasr a radially outstanding wall or plate 16. integral therewith. A secondvv'a'll! or plate v18 encirclesthe driven shaft and'V is located in' axially-spaced parallel relation with said plate V16: and. issecured rigidly and'detach'ably therewithfby'theboltslQO andL nutsi22'. The' walls-'16 and 18 constitute acarr'erffor the' pinion gears 24C'` off the planetary gearing'l mechanism. Said: gears are locatedibetwe'en said vwalls 1,6 andl 18'4 and'` are journalledupon pins 267 carried bylsaid walls'.r Al spur gea-rf 28is fixed tothe driven shaf't12 vandisin mesh with said pinion gears 24; A floating: internal .gear 30 surrounds said pinionge'ars' 26 and is in mesh therewith; Said-internal gear is Vsupported rotatably upon, the outer cylindrical faces of said Walls 16 and 18. The outer face82 of said internal gear is cys-f lindri'cal and' said gear constitutes a brake drum-ivvhich is encircled and isfad'apted Vtothe engaged-bya brakeband Sllto hold:` the internal gear stationary to set the gearing for reverse drive.

Clutch mechanism is provided to connect the driving and driven shafts directly whereby to set the gearing for forward drive. Said clutch mechanism includes a hub 36 which is keyed to and is slidable on the driven shaft and carries a set of clutch plates 38. Said clutch plates are adapted to be engaged by a second set of clutch plates 40 carried by a cylindrical wall 42 which is integral with the wall 18. Clutch operating mechanism including links 44 is arranged to press said plates together, whereby to connect the two shafts directly. Said links are pivoted to a sleeve 46 that is keyed to and is slidable on the driven shaft vl2 and is adapted to be moved axially in opposite directions in set# ting the gearing both for forward and reverse drive. An operating handle 48 is arranged to actuate the mechanism and also to move the sleeve 46.

The brake band 34, `in connection with which-this invention more particularly relates, is resilient and is adapted to be contracted about the brake drum or internal gear 30 to set the gearing for reverse drive. The brake band has'spaced confronting ends at the top of the gearing which are provided with spacedupstanding lugs or ears 50 and 52 respectivelyv which usually are integral with said band. Said lugs areV provided with aligned Y passages 54 therethrough through which a cylindrical rod 56 is extended. Saidrod is screw threaded at one end and'hasa nut 58 on the screw threads whereby movement of the rod toward the right (Fig.` l) also edects the movement of the lug 50 in the same direction. The other end of the rod, whichis extended outwardly and to the right beyond the lug 52, is provided with an axially-extended slot 60 therein. vA cam roller 62 is `received in the outer end of said slot and is rotatably connected with the rod 56 by a rivet 64 or the equivalent. A cam bar 66 is extended horizontally through said slot 60 between said roller and the lug 52 and has a tapered or inclined cam face 68 which is adapted to engage the cam roller 62l and has on its other side a flat and straight face 70 which confronts the upstanding outer side of thelug 52. The rear end of said cam bar 66 is nivotally connected with an arm 2 that is reciprocated forwardly and rearwardly under control of the operating handle 48, whereby to effect the contraction and release of the brake band.

A self-seating pressure disc 74 is interposed between the iiat side 70 of thecambar and the lug 52 and is provided with apassage 7 6 therein through which said rod 56 is loosely received. The outer face 78 of said disc is iiat and the iiat face 70 of said cam bar is adapted to be seated thereon'and slide thereover- The opposite face ofsaid pressure disc is spherical in configuration, as indicated at 80, and is received within a spheroidal recess 82 formed in the outer face of said lug 52 concentric with the rod-passage 54 therethrough. Thus, said pressure disc has a good bearing upon said lug at all times regardless of the angular relation between the two. Viith this arrangement, regardless of any angular displacement there may be between the cam bar 66 and the lug 52, in the usual operation of the mechanism, the fiat face 7 0 of said cam bar can always be seated upon the fiat face 7 8 of the pressure member 74 and have full bearing across the full diameter of said pressure member since the pressure member will automatically change its position or rock in its spherical seat in the lug 52 to meet changes in the relative positions of the parts. A firm, full bearing of the cam bar on the brake band is thus secured and rapid or undue wear ofthe parts is thus prevented.

A similar self-seating pressure member 84 is interposed between the nut 58 and the other lug 50 of the brake band to insure good pressure engagement between said lug and the rod 56 regardless of angular variations therebetween. A

I claim:

1. VBrake mechanism for reversing gearing including 'a contractile brake band having proximate ends, a rod supported by said brake band and bearing on one of said ends and passed loosely through said other end, a barsupporting disc surrounding said rod loosely having a spheroidal seat in said other end of said brand and an opposing flat outer face, and a cani bar one end of which is supported by said rod having means for moving said rod vin one direction and having a flat face which is seated slidably upon the fiat face of said disc regardless of angular variation between said cam bar and said other end of said brake band.

2. In a brake mechanism for reversing gearing, the combination of a rotatable brake drum, a brake band contractible about said drum having confronting free ends, a cam bar movable transversely of said free ends for contracting the band having a tapered face which engages a component part of one of said ends and an opposing flat straight'face supported by said other end of said band,and a self-seating bar-supporting memberinterposed between said other end and said iiat straight face having a spheroidal rocking seat in said'other end, and a flat face which is slidably engaged byv said fiat straight face of said cam bar regardless of variation of an* gular relation between said cam bar and said other end of the brake band. K

In testimony whereof, I have signed my name to this specification.

WALTER C. WARE. 

